Mechanical power output, bench press, fitrodyne premium, kinematic analysis, dynamic analysis

The aim of this study was to verify validity of indirect measurement of mechanical muscle power output at bench press exercise. As a criterion of validity we selected a combination of kinematic and dynamic analyses.Factual significance of differences in average values of power output, force and speed, measured by a method using indirect force measurement in comparison to the selected criterion, was evaluated by means of effect of size (ES). Power output measurement method using indirect force measurement showed lower values of force in relation to the criterion in the whole scope of selected loads. Speed values in the whole scope of selected loads did not show any signicifant difference between the criterion and the verified method. Mechanical muscle power output measured by method using indirect force measurement is lower in relation to the criterion, especially in the low scope of loads, where also validity rate was low (R = 0.5).